patch 8.2.0281: two placed signs in the same line are not combined

Problem:    Two placed signs in the same line are not combined.  E.g. in the
            terminal debugger a breakpoint and the PC cannot be both be
            displayed.
Solution:   Combine the sign column and line highlight attributes.
diff --git a/src/version.c b/src/version.c
index 2ff3460..d02cf9a 100644
--- a/src/version.c
+++ b/src/version.c
@@ -739,6 +739,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    281,
+/**/
     280,
 /**/
     279,